Officine Galileo Esagon 8.5cm f/2.8

Officine Galileo Esagon 8.5cm f/2.8

The Esagon 8.5cm f/2.8 is an 85mm short telephoto made by the Italian optical firm Officine Galileo, supplied in the Leica screw mount (LTM, also called M39). It belongs to the small group of Italian rangefinder optics that appeared around the mid twentieth century, and it is an uncommon item that draws interest chiefly from collectors of Officine Galileo equipment rather than from working photographers.

As fitted in LTM, the lens uses the 39mm screw thread shared with Leica and other screw-mount bodies. It is not rangefinder coupled, so focusing is set on the lens barrel and the camera's rangefinder does not measure distance for it; in practice this means it is best used with scale or zone focusing, or with an accessory reflex or distance finder. It carries no six-bit coding, which is consistent with a lens of this era and mount. The f/2.8 maximum aperture is modest for an 85mm, in keeping with a compact short telephoto rather than a fast portrait optic.

Detailed, independently verified documentation for this specific Esagon, including its optical formula, coatings, barrel finishes, and any version differences, is scarce. Where reliable sources are lacking, those details are best treated as unconfirmed rather than assumed.

Optical qualities

Rendering There is little reliable, published material describing the rendering of the Esagon 8.5cm f/2.8, so its sharpness, contrast, bokeh, flare behavior, distortion, and vignetting are not well documented. As a result, no firm performance characterization can be given here without risking unsupported claims. Prospective users should judge a given example on its own condition and on direct testing rather than on established consensus, which does not appear to exist for this lens.

History

Collector Notes Because documented references for this lens are limited, buyers should verify the mount thread (LTM/M39) and confirm that focusing operates on the barrel, since the lens is not rangefinder coupled and will not be governed by the camera's rangefinder. As with most older optics, inspect the glass for haze, separation, and cleaning marks, and confirm the aperture mechanism moves freely. Originality of any markings, caps, or hoods should be checked individually, as factory variants and accessories for this model are not well catalogued in accessible sources.

Sources

No reliable, lens-specific published sources were located during research for this entry. The descriptions above are based only on the specifications already confirmed by LeicaLensList (Officine Galileo Esagon 8.5cm f/2.8, 85mm, f/2.8 maximum aperture, LTM mount, not rangefinder coupled, no six-bit coding). Additional history, optical design details, and version information have been intentionally omitted rather than guessed.